/*
 * Copyright (c) 2014, Peter Thorson. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the WebSocket++ Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL PETER THORSON BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef WEBSOCKETPP_COMMON_CPP11_HPP
#define WEBSOCKETPP_COMMON_CPP11_HPP

/**
 * This header sets up some constants based on the state of C++11 support
 */

// Hide clang feature detection from other compilers
#ifndef __has_feature         // Optional of course.
#define __has_feature(x) 0  // Compatibility with non-clang compilers.
#endif
#ifndef __has_extension
#define __has_extension __has_feature // Compatibility with pre-3.0 compilers.
#endif

// The code below attempts to use information provided by the build system or
// user supplied defines to selectively enable C++11 language and library
// features. In most cases features that are targeted individually may also be
// selectively disabled via an associated _WEBSOCKETPP_NOXXX_ define.

#if defined(_WEBSOCKETPP_CPP11_STL_) || __cplusplus >= 201103L || defined(_WEBSOCKETPP_CPP11_STRICT_)
// This check tests for blanket c++11 coverage. It can be activated in one
// of three ways. Either the compiler itself reports that it is a full
// C++11 compiler via the __cplusplus macro or the user/build system
// supplies one of the two preprocessor defines below:

// This is defined to allow other WebSocket++ common headers to enable
// C++11 features when they are detected by this file rather than
// duplicating the above logic in every common header.
#define _WEBSOCKETPP_CPP11_INTERNAL_

// _WEBSOCKETPP_CPP11_STRICT_
//
// This define reports to WebSocket++ that 100% of the language and library
// features of C++11 are available. Using this define on a non-C++11
// compiler will result in problems.

// _WEBSOCKETPP_CPP11_STL_
//
// This define enables *most* C++11 options that were implemented early on
// by compilers. It is typically used for compilers that have many, but not
// all C++11 features. It should be safe to use on GCC 4.7-4.8 and perhaps
// earlier.
#ifndef _WEBSOCKETPP_NOEXCEPT_TOKEN_
#define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
#endif
#ifndef _WEBSOCKETPP_CONSTEXPR_TOKEN_
#define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
#endif
#ifndef _WEBSOCKETPP_INITIALIZER_LISTS_
#define _WEBSOCKETPP_INITIALIZER_LISTS_
#endif
#ifndef _WEBSOCKETPP_NULLPTR_TOKEN_
#define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
#endif
#ifndef _WEBSOCKETPP_MOVE_SEMANTICS_
#define _WEBSOCKETPP_MOVE_SEMANTICS_
#endif
#ifndef _WEBSOCKETPP_DEFAULT_DELETE_FUNCTIONS_
#define _WEBSOCKETPP_DEFAULT_DELETE_FUNCTIONS_
#endif

#ifndef __GNUC__
// GCC as of version 4.9 (latest) does not support std::put_time yet.
// so ignore it
#define _WEBSOCKETPP_PUTTIME_
#endif
#else
// In the absence of a blanket define, try to use compiler versions or
// feature testing macros to selectively enable what we can.

// Test for noexcept
#ifndef _WEBSOCKETPP_NOEXCEPT_TOKEN_
#ifdef _WEBSOCKETPP_NOEXCEPT_
// build system says we have noexcept
#define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
#else
#if __has_feature(cxx_noexcept)
// clang feature detect says we have noexcept
#define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
#elif defined(_MSC_VER) && _MSC_VER >= 1900
// Visual Studio 2015+ has noexcept
#define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
#else
// assume we don't have noexcept
#define _WEBSOCKETPP_NOEXCEPT_TOKEN_
#endif
#endif
#endif

// Test for constexpr
#ifndef _WEBSOCKETPP_CONSTEXPR_TOKEN_
#ifdef _WEBSOCKETPP_CONSTEXPR_
// build system says we have constexpr
#define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
#else
#if __has_feature(cxx_constexpr)
// clang feature detect says we have constexpr
#define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
#elif defined(_MSC_VER) && _MSC_VER >= 1900
// Visual Studio 2015+ has constexpr
#define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
#else
// assume we don't have constexpr
#define _WEBSOCKETPP_CONSTEXPR_TOKEN_
#endif
#endif
#endif

// Enable initializer lists on clang when available.
#if __has_feature(cxx_generalized_initializers) && !defined(_WEBSOCKETPP_INITIALIZER_LISTS_)
#define _WEBSOCKETPP_INITIALIZER_LISTS_
#endif

// Test for nullptr
#ifndef _WEBSOCKETPP_NULLPTR_TOKEN_
#ifdef _WEBSOCKETPP_NULLPTR_
// build system says we have nullptr
#define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
#else
#if __has_feature(cxx_nullptr)
// clang feature detect says we have nullptr
#define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
#elif defined(_MSC_VER) &&_MSC_VER >= 1600
// Visual Studio version that has nullptr
#define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
#else
// assume we don't have nullptr
#define _WEBSOCKETPP_NULLPTR_TOKEN_ 0
#endif
#endif
#endif
#endif

#endif // WEBSOCKETPP_COMMON_CPP11_HPP
